Dhcpv6RequestPrefix function

The Dhcpv6RequestPrefix function requests a specific prefix.


DWORD APIENTRY Dhcpv6RequestPrefix(
  _In_    LPWSTR                         adapterName,
  _In_    LPDHCPV6CAPI_CLASSID           classId,
  _Inout_ LPDHCPV6PrefixLeaseInformation prefixleaseInfo,
  _Out_   DWORD                          pdwTimeToWait


adapterName [in]

Name of the adapter on which the prefix request must be sent.

classId [in]

Pointer to a DHCPV6CAPI_CLASSID structure that contains the binary ClassId information to send on the wire.

Note  DHCPv6 Option Code 15 (0x000F) is not supported by this API. Typically, the User Class option is used by a client to identify the type or category of user or application it represents. A server selects the configuration information for the client based on the classes identified in this option.
prefixleaseInfo [in, out]

Pointer to a DHCPV6PrefixLeaseInformation structure that contains the prefix lease information.

The following members of the DHCPV6PrefixLeaseInformation structure must follow these guidelines.

DHCPV6PrefixLeaseInformation memberConsideration
nPrefixesMust contain a maximum value of 10. The caller should have the memory allocated in the prefixArray member based on the number of prefixes specified.
iaidA unique positive number assigned to this member. This same value should be reused if this function is called again.

This mandatory value must be set by the calling application.

ServerIdLenMust contain a maximum value of 128. The caller must have the memory allocated in the ServerId member based on the specified ServerIdLen value.


The caller must follow these considerations when assigning the values of the nPrefixes, iaid, and ServerIdLen members of the DHCPV6PrefixLeaseInformation structure. Based on these values, memory must also be properly allocated to the ServerId and PrefixArray members before the Dhcpv6RequestPrefix function is called.

pdwTimeToWait [out]

Contains the number of seconds a requesting application needs to wait before calling the Dhcpv6RenewPrefix function to renew its acquired prefixes. A value of 0xFFFFFFFF indicates that the application does not need to renew its lease.

Return value

Returns ERROR_SUCCESS upon successful completion.

Return codeDescription

The value of the nPrefixes or the ServerIdLen member specified is less than the number of prefixes available from the server or the available server ID length. Increase the nPrefixes or the ServerIdLen member and make sure the corresponding memory has been allocated properly before calling the Dhcpv6RequestPrefix function again.


Returned if one of the following conditions are true:

  • AdapterName is NULL.
  • prefixleaseInfo is NULL.
  • pdwTimeToWait is NULL.
  • The iaid member of the prefixleaseInfo is zero.



Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]









© 2016 Microsoft